Although he has spent as long as two years making a short animation, the former Beatle bristled when asked whether the labor-intensive hand-drawn process would prove too costly these days for a feature.
"It's a complete fallacy about computers. They take longer than anything," he said. "Making a record, we used to make four tracks in a day with the Beatles. Now we've got equipment coming out of our ears and it takes us at least a week to make a track.
"It's just our modern world. It's a wonderful world. I'm not retro, but there are an awful lot of people getting away from synthesizers and going back to creating sounds with instruments."
Now McCartney is looking forward to a new adventure.
"Releasing this DVD is a first step. Then we'll see how the book does and then the film," he said.
McCartney is certainly accustomed to successful ventures. A British tabloid published a list last month that put Sir Paul's fortune at US$1.3 billion -- more than the combined wealth of fellow-rockers Elton John, Mick Jagger and Madonna.
"People say, `Why do you do it? Why are you still working?'" McCartney said.
"For me, it's playing."
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